Abstract
To investigate the combined compression-shear performance of self-compacting concrete (SCC), eight groups of concrete specimens under different axial compression ratios were designed, and the composite performance under different axial stresses was carried out by hydraulic servo machine. The uniaxial and tensile splitting strength of SCC were also included in the study. The failure modes of SCC were presented, discussed, and compared with normal concrete (NC). The characteristic points of stress-strain curves of SCC specimens from the experiments were extracted and analyzed under different axial compression stress. Based on the experimental results, the shear strength of compression-shear load was divided into cohesive stress and residual friction stress. The variation of residual stress and cohesive stress under the combined compression-shear stress was analyzed, and the relationship was obtained by numerical regression. Research results indicated that the residual stress increases linearly with the compression stress while the cohesive stress increased at first and then decreased. The research found that the friction coefficient of SCC was much smaller than NC due to the lack of interlocking effect. Utilizing the compression-shear strength of SCC, the material failure criteria of SCC were proposed from the view of shear failure strength and octahedral stress space, which could fit the experimental results confidently following the mathematical regression analysis. The comparison with data from other literature shows favorable consistence with the obtained criteria. The results of the study could be beneficial complement in engineering practices where SCC was applicable.
Highlights
Self-compacting concrete (SCC) is a kind of fresh concrete which has an ability to flow under its own weight, fill the required space or formwork completely, and produce a dense and adequately homogeneous material without a need for mechanical compaction [1]
In 1988, the concept of self-compacting concrete (SCC) was first proposed by Okumara et al [2,3] in Japan, and Ozawa et al [4] conducted the research on the working performance of different mix proportions, and determined the method to obtain high fluidity with less aggregate content, lower water-powder ratio, and super plasticizer
Shear failure modes in this manuscript refer to the pure shear modes, the ones under different axial compression stress
Summary
Self-compacting concrete (SCC) is a kind of fresh concrete which has an ability to flow under its own weight, fill the required space or formwork completely, and produce a dense and adequately homogeneous material without a need for mechanical compaction [1]. In 1988, the concept of SCC was first proposed by Okumara et al [2,3] in Japan, and Ozawa et al [4] conducted the research on the working performance of different mix proportions, and determined the method to obtain high fluidity with less aggregate content, lower water-powder ratio, and super plasticizer. Scholars world widely have conducted comprehensive research on SCC, mainly including the mixture ratio, working. Su et al [6] proposed a new SCC mixture ratio design method, which is simpler than the method proposed by Japan instant concrete association and can meet the performance requirements of different test methods. In order to ensure the working performance of SCC, its testing methods include filling property, segregation resistance and gap passing property. In the recent 20 years, SCC has been used and will have more potential usage in civil engineering, such as the retrofit of existing buildings [13] or used as main load-bearing elements in structures [14]
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